jquery input box number limit plug-in_jquery

(function($){
var keyCode={
BACKSPACE: 8,
CAPS_LOCK: 20,
COMMA: 188,
CONTROL: 17,
DELETE: 46,
DOWN: 40,
END: 35,
ENTER: 13,
ESCAPE: 27,
HOME: 36,
INSERT: 45,
LEFT: 37,
// NUMPAD_ADD: 107,
// NUMPAD_DECIMAL: 110,
// NUMPAD_DIVIDE: 111,
// NUMPAD_ENTER: 108,
// NUMPAD_MULTIPLY: 106,
// NUMPAD_SUBTRACT: 109,
PAGE_DOWN: 34,
PAGE_UP: 33,
PERIOD: 190,
RIGHT: 39,
SHIFT: 16,
SPACE: 32,
TAB: 9,
UP: 38
}
var isControlCode=function(key){
for(name in keyCode){
if(keyCode[name]==key)
return true;
}
return false;
}
var number=function(event){
var t=this;
if(event.shiftKey)
return false;
var key=event.keyCode;
if(isControlCode(key))
return;
if(key<48 || key>105)
return false;
if(key>57 && key<96)
return false;
}
var ControlList={};
var control=Class.extend({
init:function(obj){
this.Event=[];
this.target=$(obj);
},
Add:function(settings){
var t=this;
t.Event.push(settings);
return t;
},
Bind:function(){
var t=this;
if(!t.target){
return;
}
t.target.each(function(){
var b=$(this);
b.bind("keydown",t.event.bind(t)).bind("keyup",t.event.bind(t));
if(jQuery.browser.msie)
{
b.bind("paste",t.event.bind(t));
}
else{
b.bind("input",t.event.bind(t));
}
});
},
getmethods:function(type){
var t=this;
var list=[];
$(t.Event).each(function(i,item){
if(!item.type || !item.method)
return;
if(item.type=="all"){
list.push(item.method);
}else
{
if(item.type==type){
list.push(item.method);
}
}
});
return list;
},
IsSuccess:function(list,event,obj){
var istrue=true;
for(var i=0;iif(list[i].call(obj,event)===false)
{
istrue=false;
break;
}
}
return istrue;
},
event:function(ev){
var t=this;
var event=ev.originalEvent;
var obj=ev.target;
return t.IsSuccess(t.getmethods(ev.type),event,obj);
}
});
control.Add=function(obj,settings){
var con= ControlList[this.selector];
if(!con)
{
con=new control(obj);
ControlList[this.selector]=con;
con.Bind();
}
con.Add(settings);
return control;
}
$.fn.numberable=function(){
$(this).css("imeMode","disabled");
control.Add(this,{type:"keydown",method:number}).Add(this,{type:"keyup",method:number});
function repnumber(event){
var o= $(this);
if(o.val()){
o.val(o.val().replace(/[^d]/g,""));
}
}
if(jQuery.browser.msie){
control.Add(this,{type:"paste",method:function(event){var o=this;
setTimeout(repnumber.bind(o,event),0);
}
});
}
else
{
control.Add(this,{type:"input",method:repnumber});
}
return this;
}
})(jQuery);

$(".class").numberable();